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Ubuntu 26.04 GIFLIB Critical Denial of Service 2026

Linuxsecurity •LinuxSecurity Advisories • July 22, 2026

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GIFLIB could be made to crash or run programs if it opened a specially crafted file. Software Description: - giflib: library for GIF images Details: It was discovered that GIFLIB incorrectly handled certain GIF image files. If a user or automated system were tricked into opening a specially crafted GIF file, a remote attacker could use this issue to cause GIFLIB to crash, resulting in a denial of service, or possibly execute arbitrary code.

GIFLIB could be made to crash or run programs if it opened a specially

Software Description:

- giflib: library for GIF images

It was discovered that GIFLIB incorrectly handled certain GIF image files.

If a user or automated system were tricked into opening a specially crafted

GIF file, a remote attacker could use this issue to cause GIFLIB to crash,

resulting in a denial of service, or possibly execute arbitrary code.

The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS giflib-tools 5.2.2-1ubuntu3.2 libgif7 5.2.2-1ubuntu3.2 Ubuntu 24.04 LTS giflib-tools 5.2.2-1ubuntu1.2 libgif7 5.2.2-1ubuntu1.2 Ubuntu 22.04 LTS giflib-tools 5.1.9-2ubuntu0.3 libgif7 5.1.9-2ubuntu0.3 In general, a standard system update will make all the necessary changes.

CVE-2026-23868, CVE-2026-26740

Ubuntu Security Notice USN-8583-1

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The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical GIFLIB Vulnerabilities in Ubuntu Lead to Potential Remote Code Execution A critical vulnerability in GIFLIB has been identified, allowing remote attackers to exploit specially crafted GIF files. This flaw can lead to denial of service or arbitrary code execution if a user or automated system is tricked into opening a malicious GIF. The vulnerabilities are linked to CVE-2026-23868 and CVE-2026-26740, which were disclosed on July 22, 2026. Affected systems include Ubuntu 26.04 LTS, 24.04 LTS, and 22.04 LTS. Users are advised to update their systems to mitigate the risks. The vulnerabilities were discovered during routine audits and are considered high-risk due to their potential impact on system integrity. Standard system updates are recommended to address these issues. 2 sources 71

Extracted Entities

Ubuntu 26.04 GIFLIB Critical Denial of Service 2026

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Extracted Entities

Attack Types (1)

Companies (1)

CVEs (2)